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I am trying to read a JSON file, rename the property names, and export a new JSON with the new names. As stated in this example, https://www.newtonsoft.com/json/help/html/JsonPropertyName.htm, we can use JsonProperty to specify a different name internally in the code. However, when you export the json, it returns the original name. So in the example it still returned "release_date" instead of "ReleaseDate" when it was logged in the console. Is there any way to do this without creating a brand new object?

To clear things up, here is example of what I am trying to do:

JSON Input:

{ "name": "Starcraft", "release_date": "1998-01-01T00:00:00" }

Object Used to deserialize the data:

public class Videogame { public string name{ get; set; } [JsonProperty("release_date")] public DateTime releaseDate { get; set; } }

Code that is called:

var json = JsonConvert.DeserializeObject<Videogame>(File.ReadAllText(path)) Console.WriteLine(JsonConvert.SerializeObject(json));

Resulted Output:

{ "name": "Starcraft", "release_date": "1998-01-01T00:00:00" }

Desired Output:

{ "name": "Starcraft", "releaseDate": "1998-01-01T00:00:00" }

The only way that I currently know how to solve it is to create a new object and use it to serialize my output. Wasn't sure if there is any simpler way to do this.

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2 Answers 2

Reset to default
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The following will work:

public class Videogame { public string name{ get; set; } [JsonProperty("release_date")] public DateTime old { set { ReleaseDate = value; } } [JsonProperty("releaseDate")] public DateTime ReleaseDate { get; set; } }

When deserializing, the old property will redirect its value to the new property.

Since the old property is a setter only, it will not be serialized back.

I would not consider this approach for large amounts of renaming. It's then better to follow the advices given in the comments.

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1 Comment

Nice solution, easy to implement
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You could use custom resolve to create desired behaviour:

public class CustomContractResolver : DefaultContractResolver { public bool UseJsonPropertyName { get; } public CustomContractResolver(bool useJsonPropertyName) { UseJsonPropertyName = useJsonPropertyName; } protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization) { var property = base.CreateProperty(member, memberSerialization); if (!UseJsonPropertyName) property.PropertyName = property.UnderlyingName; return property; } } public class ErrorDetails { public int Id { get; set; } [JsonProperty("error_message")] public string ErrorMessage { get; set; } } var json = "{'Id': 1,'error_message': 'An error has occurred!'}"; var serializerSettings = new JsonSerializerSettings() { ContractResolver = new CustomContractResolver(false) }; var dezerializerSettings = new JsonSerializerSettings { ContractResolver = new CustomContractResolver(true) }; var obj = JsonConvert.DeserializeObject<ErrorDetails>(json, dezerializerSettings); var jsonNew = JsonConvert.SerializeObject(obj, serializerSettings);

Kudos to NtFreX and his answer. I'm providing mine so that you can indicate that your question is resolved.

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2 Comments

@dbc Actually I think it would be the best to leave duplicate badge and just delete my answer as it's really similar. Gonna do it in a couple of minutes.
Oh, actually I can't do that. Will include the original author then.

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